diff --git a/services/src/main/java/io/grpc/protobuf/services/InetAddressUtil.java b/services/src/main/java/io/grpc/protobuf/services/InetAddressUtil.java
index 2ba09c41b268..b8bacbc2bb36 100644
--- a/services/src/main/java/io/grpc/protobuf/services/InetAddressUtil.java
+++ b/services/src/main/java/io/grpc/protobuf/services/InetAddressUtil.java
@@ -91,4 +91,4 @@ private static String hextetsToIPv6String(int[] hextets) {
     }
     return buf.toString();
   }
-}
\ No newline at end of file
+}
diff --git a/services/src/main/java/io/grpc/protobuf/services/ProtoReflectionService.java b/services/src/main/java/io/grpc/protobuf/services/ProtoReflectionService.java
index 38a9ea23148d..4a7840a3ad91 100644
--- a/services/src/main/java/io/grpc/protobuf/services/ProtoReflectionService.java
+++ b/services/src/main/java/io/grpc/protobuf/services/ProtoReflectionService.java
@@ -62,14 +62,14 @@
  * extension.
  */
 @ExperimentalApi("https://github.com/grpc/grpc-java/issues/2222")
-public class ProtoReflectionService extends ServerReflectionGrpc.ServerReflectionImplBase {
+public final class ProtoReflectionService extends ServerReflectionGrpc.ServerReflectionImplBase {
 
   private final Object lock = new Object();
 
   @GuardedBy("lock")
   private final Map<Server, ServerReflectionIndex> serverReflectionIndexes = new WeakHashMap<>();
 
-  protected ProtoReflectionService() {}
+  private ProtoReflectionService() {}
 
   /**
    * Creates a instance of {@link ProtoReflectionService}.